SNOOS: Small Near-Earth Object Observing System
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Definitions and Acronyms
| AU | Astronomical Unit (149.6M km); Distance between Earth and Sun |
| Countermeasure | Physical mitigation technology applied to an avoidable object |
| Impact Response | Mitigation activities for responding to unavoidable objects |
| NEA | Near Earth Asteroid |
| NEO | Near Earth Object; Comets and asteroids whose closest orbital approach is within 1.3AU of the sun |
| PHO | Potentially Hazardous Object; NEOs within 0.05 AU of the earth's orbit that could cause substantial damage to the Earth |
| Absolute Magnitude (H) | NEO visible signature at 1AU; measure of brightness |